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首页> 外文学位 >A SEARCH FOR RADIO PULSARS IN THE NORTHERN SKY: DISCOVERY OF A PULSAR IN A UNIQUE BINARY SYSTEM.
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A SEARCH FOR RADIO PULSARS IN THE NORTHERN SKY: DISCOVERY OF A PULSAR IN A UNIQUE BINARY SYSTEM.

机译：在北部天空中搜索无线电脉冲：在唯一的二元系统中发现脉冲。

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摘要

A sensitive search for pulsars has been conducted using the 92-meter transit telescope of the National Radio Astronomy Observatory. Nearly 50% of the sky north of +20(DEGREES) declination was searched, using an on-line computer to process all search data in real time. The search program was sensitive to pulsars in the period range 0.0333 to 3.9 seconds, with dispersion measures between 0 and 130 cm('-3)pc. The limiting flux density reached was approximately 10 mJy at 390 MHz.; Twenty-three previously unknown pulsars were discovered in the course of the search, and three of these are noteworthy. PSR 0320+39, 28with a pulse period of 3.0321 seconds, has recently been found to exhibit subpulses which drift exclusively from the leading to the trailing edge of the pulse profile. The position and dispersion measure of PSR 0458+46 are consistent with a physical association between that pulsar and the supernova remnant HB 9. PSR 0655+64 has been found to be a member of a binary system.; The pulsar parameters and orbital elements of the PSR 0655+64 system were determined through an extensive series of pulse timing observations at the NRAO 43-meter telescope. The orbital eccentricity is unmeasurably small, with an upper limit of 4 x 10('-5), and the pulsar's period derivative is smaller than any previously known. Evolutionary considerations have suggested that the pulsar's companion might be a visible star, and an extremely faint star has been identified optically at the pulsar position. Observations with the Einstein X-ray satellite have detected no X-rays from the system. The available evidence indicates that the pulsar's companion may be an unusually faint dwarf star.
机译：美国国家射电天文台的92米过境望远镜已经对脉冲星进行了灵敏的搜索。使用在线计算机实时处理+20（DEGREES）偏角以北的近50％的天空。搜索程序对脉冲星敏感，周期范围为0.0333至3.9秒，分散度为0至130 cm（'-3）pc。在390MHz下达到的极限通量密度约为10mJy。在搜索过程中发现了23个先前未知的脉冲星，其中三个值得注意。最近发现，脉冲周期为3.0321秒的PSR 0320 + 39表现出的子脉冲仅从脉冲轮廓的前沿到后沿漂移。 PSR 0458 + 46的位置和弥散度与该脉冲星和超新星残余HB 9之间的物理联系一致。PSR0655 + 64被发现是二元系统的成员。 PSR 0655 + 64系统的脉冲星参数和轨道元素是通过在NRAO 43米望远镜上进行的一系列脉冲定时观测确定的。轨道偏心率极小，上限为4 x 10（'-5），脉冲星的周期导数比以前任何已知的值都要小。进化方面的考虑表明，脉冲星的伴星可能是可见的恒星，并且在脉冲星的位置以光学方式识别出了非常微弱的恒星。用爱因斯坦X射线卫星进行的观测未检测到系统发出的X射线。现有证据表明，脉冲星的伴星可能是一颗异常昏暗的矮星。

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  • 作者

    DAMASHEK, MARC.;

  • 作者单位

    University of Massachusetts Amherst.;

  • 授予单位 University of Massachusetts Amherst.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 1983
  • 页码 88 p.
  • 总页数 88
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

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